X = int(input())
if X >= 30 :
    print ('Yes')
else :
    print ("No") X = int(input()) X int(input()) int input() input if X >= 30 :
    print ('Yes')
else :
    print ("No") X >= 30 X 30 print ('Yes') print 'Yes' print ("No") print "No" X = int(input()) int(input()) X
X = int(input())
if X >= 30 :
    print ('Yes')
else :
    print ("No")
